Eric Edgar wrote on 2005-10-27:
I have tried the different serialize_io option and it didnt help much.
it is a s400 based card.
Here are the numbers off the 2 biggest chips on the card.
belkin f5u503
CHIP 1
tsb12lv26
ca-22a752t
f731652a
CHIP 2
22any0ct
tsb41ab3
...
I have not heard anything negative about Belkin hardware so far. Also,
TI lists only one erratum concerning the TSB41AB3 which is not related
to the low throughput. The culprit is probably either the Maxtor
FireWire enclosure (PHY, link layer controller & IDE bridge, firmware,
or perhaps even the included HDD) or our software...
Vendor: Maxtor Model: 1394 storage Rev: v1.3
Type: Direct-Access-RBC ANSI SCSI revision: 04
SCSI device sda: 156355584 512-byte hdwr sectors (80054 MB)
...
hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 644 MB in 2.01 seconds = 320.40 MB/sec
Timing buffered disk reads: 8 MB in 3.09 seconds = 2.59 MB/sec
...
2.6.14-rc4
I dont seem to see any error messages ... just bad performance.
Maxtor's currently available enclosures are noticeable slower than
comparable products:
http://www.macworld.com/2005/10/reviews/firewiremain/index1.php
Although according to these application test on OS X, they should not be
as extremely slow as hdparm measures.
I remember though that Maxtor FireWire drives have been used under Linux
before. Alas www.linux1394.org and its hardware compatibility list are
offline again at the moment.
That is all I can say about it so far.
--
Stefan Richter
-=====-=-=-= =-=- ====-
http://arcgraph.de/sr/
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